sherman



(No Model.) 4 Sheets-Sheet l. A. M. SHERMAN.

Recording Pressure-Gage. No. 228,479 Patented June 8,1880.

N. ErERS. FHDTO-LITNQGRAPNER WASH NGTON D c 4 Sheets-Sheet 2.

(No Model.) v

' A. M. SHERMAN. Recording Pressure-Gage. i No. 228,479. Patented June 8,1880.

J wzawm N-PiTQiS, MTO'U'IWGIAPNER, WASHINGTONY D C,

(No Model.) 4 Sheets-Sheet 4. A. M. SHERMAN.

Recording Pressure-Gage. No. 228,479. Patented June 8,1880.

JWzZZw euwuwwm ,c /zw'm. 6 fiww W N. PETERS, PHOTO-LITHOGRAPHER, WASHINGTON. D C.

UNITED STATES ALLEN M. SHERMAN,

PATENT OFF CE.

OF NEW YORK, N. Y.

RECORDING PRESSURE-GAGE.

SPECIFICATION forming part of Letters Patent No. 228,479, dated June 8, 1880,

Application filed April 8, 1880.

To all. whom it may concern Be it known that I, ALLEN M. SHERMAN, of the city, county, and State of New York, have invented certain new and useful lmprovements in Pressure-Recordin g Gages and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, forming a part of this specification, in which Figure l is a front elevation. Fig. 2 is a top view, the portion above the line Z Z, Fig. 3, being removed. Fig. 3 is a rear elevation, partly in section, the portion to the rear of X X, Fig. 2, and the alarm-movement being removed. Fig. 4 is a side view.

Similar letters indicate similar parts in all the figures.

To the under side of the hollow base A (shown in all the figures) is secured, by bolts T T, a chamber, a, formed of a rigid saucershaped bottom disk, A, and an elastic top plate or diaphragm spring, A (shown in Fig. 3,) said bottom disk receiving the pipe which transmits the steam or other fluid in the coupling to, Figs. 1 and 3. Secured to the top of said base is a frame composed of the uprights N N and the transverse rods P P, and secured to these uprights is the table I, over which the ribbon 9 passes, and just above the table the bar 0, Figs. 2, 3, and 4,. which supports the bevel-pinion d. To the front of the frame the indicator dial-plate Kis secured, and in front of the frame the chronometermovement J is fastened to the top of the base A. On the top of the frame the alarnrmovement N, Fig. 3, is secured in any convenient manner.

The rod B, Figs. 2, 3, and 4., is attached at its lower end to the stud a? on the diaphragmspring by a pin, and is provided at its upper end with teeth, which mesh into and engage the pinion b on shaft 0, the teeth on the rod being adjusted to the pinion by means of the set-screw 1), operating in anut secured to the front of the frame. The shaft 0 passes through and beyond its bearing in the front of the frame, and carries the imlicator-hand it, as shown in Figs. 2 and 4. Its bearing at its rear end is in asocket in the end of set-screw 0, operating in a nut in the frame, as shown in Figs. 2 and 4.. On this shaft 0 is fastened (N0 model.)

the bevel-gear wheel 1), which engages the bevel-pinion d, the hub of which operates in a perforation in the bar 0, Figs. 2, 3, and 4. The arm E is secured to this pinion, and carries at its extremity a crayon-holder 0, into which the crayon F is inserted.

If desired, a small weight, f, may be placed on the crayon, to force it down more lirmly on the ribbon g as said ribbon passes from spool G over the table I and drum G under the roller H, Figs. 2, 3, and 4-.

The spool G and drum G are provided with shafts which revolve in bearings, one end of each shaft entering its respective bearing in. the front of the frame N, the other extremity being socketed to receive the end of its respective set-screw in the rear of the frame, as shown at It It, Figs. 2 and 4.

The spool G is formed of two circular disks, the front one permanently.secured to the shaft. The rearone hasa screw-thread tapped through its center. The rear end of the shaft having a corresponding thread, a sleeve or tube upon which the ribbon has been previously wound may be slipped on the shaft, the disk screwed thereon, and the spool adjusted in its bearings rapidly and conveniently, as before described.

The drum G is a light hollow metal cylinder, having a ridge or flange at each end for the guidance of the ribbon. The surface is either serrated or made rough by a jacket of emery-cloth or other like device, so that when the weighted roller H forces the ribbon in close contact with the surface of the drum said ribbon will be drawn from the spool G over the table I and under the crayon F, when said drum is revolved by the action of the chronometer-movement J. The arbor of the chronometer-movelneut passes through the front of the frame N, and at its extremity carries the gear-wheel J which engages the gear-wheel G rigidly secured to the front end of the drum G". (See Figs. 2, 3, and 4.)

The setting-arm L is secured at its lower end by a pivot to the rear of the indicator dialplate K. At its upper end, and between it and the dial-plate, the T-shaped trip1' ing-lever lis pivoted, on the head of which rests the curvi linear arm M, pivoted at t, Fi 3.

The projection t on arm M (shown in Figs. 3 and 4c) rests on and confines the trip m of the alarm-movement, so that when arm M is raised by the head of lever I, when operated on by pin S on the indicator-hand 7t (said pin moving in and protruding through the slot shown in the indicator-plate) movingthe pendent limb of said lever, the alarm-trip m will be released and thealarm sounded. (See Figs. 2, 3, and 4.)

The setting-arm L, carrying said tripping lever I, may be at any time adjusted so that pin S on hand It will engage pendent limb of lever l at any point on the ii'nlicator-dial desired by moving it over on its pinion until the pendant of the lever I, as seen through the slot, coincides with that point. A tell-tale hand, In, on said dial is provided, operated upon by the pin S on hand I; only, its object being to expose at a glance the extreme pres.- ure that has been indicated by hand 7t since it had been last set against the pin S on said hand.

The cl1ronometer-movement is provided with the ordinary clock dial, hour and minute hands, thus combining an accurate timepiece with the gage. At the rear of the base A, and forming part of it, is the bifurcated wall-plate V, the whole l'ormin g a bracket. A large headed bolt or screw being fixed in the desired location, the plate V is adjusted on it, and is then further secured by the insertion of two small nails or screws through the perforations in the lower part of the plate.

The pipe transmitting the steam or other fluid to the chamber a having been connected with the coupling a, Figs. 1. and 3, any movement of the spring A causes the rod B to respond, and the teeth on red B actuating the pinion b turn the shaft G, and with it the bevel-gear wheel I), which operates the bevelpinion d, and causes the arm E, attached to said pinion, to move the crayon F in. crayon holder 0 transversely over the ribbon, Figs. 2, 3, and at. As this ribbon is moved continuously over the table I through the operation of the chronometer-movement on the drum G, the result is that when the pressure does not vary the diaphragm-spring is at rest, the arm E is stationary, and a straight longitudinal mark will be shown on the ribbon, while the relative degree of movement of the spring and the crayon-bearing arm E is such (the first being augmented by the relative proportions of the different parts of the mechanism) that the slightest and almost imperceptible variation in the travel of the spring A will be readily detected on the indicator-dial K, and plainly recorded and easily discerned on the recording-ribbon. The speed of the drum being known, the precise moment that any point of the ribbon had passed under the crayon is readily discovered. If desired, transverse rectilinear lines may be ruled on the ribbon. adapted to the speed of the drum, graduated to any periods of time. A rabbet is thrilled around the top edge of the base to receive a glass shield or cover for the protection of the instrument. A slotoropeningis provided, also, through which the ribbon passes at'terleavin g the drum, as shown in Figs. 2, 3, and 4, and thence into any receptacle convenient for in spection.

Having thus described niiyinvcntion, what I claim, and desire to secure by Letters Patent, is

1. The rod B, pinion b, shaft 0, gear-wheels D (7, arm E, and crayoucarrier c, all combined, substantially as and for the purpose set forth.

2. The shaft 0, hand 7.:, pin S, lever 1, arm M, and alarm-trip an, all combined snbstan tiall y as and for the purpose set forth.

3. The setting-arm L, lever Z, arm M, hand 7., and pin S, all combined substantially as andi'or the purpose set forth.

ALLEN M. SHERMAN.

Witnesses: V

THOMAS VAN ANrwEnr, ANDREW V AN AN'rwE'i-tr. 

